Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac92a176a71d5f2…

MALICIOUS

PDF

95.1 KB Created: 2021-09-01 17:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f267391924131d3a903e0c5554991f7d SHA-1: 5abd79a3f7c1c4c9f9a69be92e6447f76585c338 SHA-256: 3ac92a176a71d5f2e5bf419a4a73d78293e22c0a3be1be852053b19e1ea349bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00e6aead69---5628133435.pdf In PDF document text
    • http://kientrucnhacuagio.com/upload/files/zibirojiral.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/dovunegijenej.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/44277936225.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/00d0e35369529891d0d73ddf64d8205a/xixilofinuzar.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/35cfe165995463e9220bc5aded7e3cd6/40643778264.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/r1sqe451svuq7ms8fdtbig26s1/bukorakuxeb.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b7440f4a0---favata.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/q92iurv98dg0oj817c48t40525/93927833838.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/gamagamurejokat.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16086a11b257e0---sekisatogadibalutev.pdfIn PDF document text
    • https://fond.ru/userfiles/file/mimoxamugazobe.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/86750779076.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/77133589541.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/097f539234600865c205bd4961f75aa6/15599237536.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0536f1b7e6991338ebfc9e5d3c606786/gisuxojitapepuxiwepolog.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/sigizomisidivutof.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608075791d056---61734072068.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/tebipu.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/0d3af5bf1f1e9c4db7790ade0f49878a/41248189832.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a622528742e---98541290868.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/54718864516.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608791ed61ea3---71672255696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=go+beyond+expectationsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 10756 bytes
SHA-256: 991644fa2f0687fd7008da99a5885a8fbae4576f9cd23afc4cd38c7f596f633a
font_01_sfnt_off00012577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12577 18828 bytes
SHA-256: 1229c2e5a89edf8143a5eae9d6216e233c0931134069e74d3d220c513628d0f7
font_02_sfnt_off0001564d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1564D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1